<!DOCTYPE html>
<html>
<head>
	<title>HTML 文本格式化</title>
</head>
<body>
	<b>This text is bold</b>
	<br/>
	<strong>This text is strong</strong>
	<br/>
	<big>This text big</big>
	<br/>
	<em>This text is emphasized</em>
	<br/>
	<i>This text is italic</i>
	<br/>
	<small>This textn is small</small>
	<br/>
	This text contains
	<sub>subscript</sub>
	<br/>
	This text contains 
	<sup>superscript</sup>
</body>
</html>